Fixed some core packages in GHCJS 8.4

pkgs/development/haskell-modules/configuration-ghcjs.nix

@@ -23,6 +23,11 @@ self: super:
       };
   in stage1 // stage2 // {
 
+  # GHCJS does not ship with the same core packages as GHC.
+  # https://github.com/ghcjs/ghcjs/issues/676
+  stm = self.stm_2_4_5_0;
+  ghc-compact = self.ghc-compact_0_1_0_0;
+
   network = addBuildTools super.network (pkgs.lib.optional pkgs.buildPlatform.isDarwin pkgs.buildPackages.darwin.libiconv);
   zlib = addBuildTools super.zlib (pkgs.lib.optional pkgs.buildPlatform.isDarwin pkgs.buildPackages.darwin.libiconv);
   unix-compat = addBuildTools super.unix-compat (pkgs.lib.optional pkgs.buildPlatform.isDarwin pkgs.buildPackages.darwin.libiconv);